This is the STI Rear Under Diffuser. This diffuser has been designed to provide the air under the with a proper exit channel out of the rear bumper at higher speeds. This will increase the downforce while stabilizing the chassis by creating a vacuum under the vehicle, pulling the chassis closer to the ground. Additionally, this rear under diffuser will add a more aggressive look to the rear bumper of your WRX, while adding value with a genuine exclusive STI component.

Highlights:

• Genuine STI component
• Black finish
• Durable construction
• Improves the aerodynamics by creating a vacuum beneath the vehicle
• Allows the air to efficiently escape the rear of the vehicle
• Adds a more aggressive and exclusive STI look